The present invention relates to a circuit and method for generation of trigger signals for a radar level gauging systems. The guide comprises a valve lifter retention portion, a push rod retention portion in communication with the valve lifter retention portion via one or more apertures, and an alignment and attachment portion extending from the push rod retention portion and configured to be retained by contact with the cylinder head gasket. The invention provides condensate from the engine exhaust gas by cooling a region of the exhaust system using cooling fluid from the engine coolant system.